104 VASCULAR PLANTS. 



SECTION I. CALYCIFLOR.E. 



Petals present and distinct, 5 — 4. Stamens 

 equaling them or a multiple. 



ORDER XXIV. MYRTALES. 



Calyx-lobes valvate in aestivation. Petals as 

 many. Stamens as many, or a multiple, some- 

 times a divisor. Carpidia united into a single 

 ovary. 



Famtly lxxi. Halorrhagidese. 



Calyx-tube adnate to the ovary; limb 4-part- 

 ed. Petals alternate with calyx-lobes. Stamens 

 not more than twice as many as petals; if equal, 

 opposite to them. Placentae central, 1-ovulate. 

 Styles as many as locules. 



1. Hippuris, L- 



Flowers £ or sometimes polygamous. Stam- 

 en 1; filament subulate. Ovary 1-locular, 

 1-ovulate: style filiform. Fruit nut-like. 



If. aquatic; leaves verticilate; flowers mi- 

 nute, solitary in the axils. 



2. Myriophyllum, L- 



Monoecious. & : petals very caducous; sta- 

 mens 8. . $ : calyx-limb, and petals minute; 

 stigma villous; ovary 4-locular, 4-ovulate. 



2f . aquatic. 



